A car starting from rest, accelerates in the +x direction. It has a mass of 1.10 x 10^3 kg and maintains and acceleration of 4.60 m/s^2 for 5 seconds. Assume that a single horizontal force accelerates the vehicle. Determine the average power generated by this force.
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A car starting from rest, accelerates in the +x direction. It has a mass of 1.10 x 10^3 kg and maintains and acceleration of 4.60 m/s^2 for 5 seconds. Assume that a single horizontal force accelerates the vehicle. Determine the average power generated by this force.
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- A 899 kg car accelerates from rest up to 26.0 m/s in 6.14 s. What is the average power output of this engine during this time? Number Units (for comparison information there are 746 W for each horse power )A car requires 72.8 hp to maintain a constant speed of 21.3 m/s on a straight, flat road. Assuming other losses are negligible, determine the magnitude of the total resistive force FR acting on the car (due to friction, air resistance, etc.). Use this conversion as needed: 1 hp = 746 W. FR = × 10³ NA 1.50 x 103-kg car starts from rest and accelerates uniformly to 16.9 m/s in 11.6 s. Assume that air resistance remains constant at 400 N during this time. (a) Find the average power developed by the engine. hp (b) Find the instantaneous power output of the engine at t = 11.6 s, just before the car stops accelerating. hp Need Help? Read It
- A bicyclist starting from rest applies a force of F = 239 N to ride his bicycle across flat ground for a distance of d = 210 m before encountering a hill making an angle of θ = 17 degrees with respect to the horizontal. The bicycle and rider have a mass of m = 120 kg combined. In this problem, you can ignore air resistance and other losses due to friction.How much work, W in joules, did the rider do before reaching the hill? What is the bicycle's speed, v in m/s, just before the hill? If the cyclist starts coasting at the bottom of the hill, what distance, di in meters, does the bike travel up the incline?Starting from rest, a 6.6-kg block slides 3.3 m down a rough 36-degree incline. The coefficient of kinetic friction between the block and the incline is μk = 0.49. Determine the net work done on the block.A bicyclist rides 1.90 km due east, while the resistive force from the air has a magnitude of 7.13 N and points due west. The rider then turns around and rides 1.90 km due west, back to her starting point. The resistive force from the air on the return trip has a magnitude of 7.13 N and points due east. Find the work done by the resistive force during the round trip. Number Units
- When an automobile moves with constant speed down a highway, most of the power developed by the engine is used to compensate for the mechanical energy loss due to frictional forces exerted on the car by the air and the road. If the power developed by the engine is 195 hp, estimate the total friction force acting on the car when it is moving at a speed of 30 m/s. One horsepower equals 746 W.Multiple-Concept Example 13 presents useful background for this problem. The cheetah is one of the fastest accelerating animals, for it can go from rest to 31.8 m/s in 3.38 s. If its mass is 119 kg, determine the average power developed by the cheetah during the acceleration phase of its motion. Express your answer in (a) watts and (b) horsepower. (a) Number i (b) Number Units UnitsAs shown in the figure below, three blocks with masses m₁ = 4.8 kg, m2 = 14 kg, and m3 = 18 kg, respectively, are attached by strings over frictionless pulleys. 1711 m2 ms The horizontal surface exerts a 32 N force of friction on m2. If the system is released from rest, use energy concepts to find the speed (in m/s) of m3 after it moves down 3.0 m. m/s
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